Inversion and Eversion

Inversion is a movement at the ankle and foot that is similar to supination. The sole of the foot moves to face the midline. However, while supination occurs by rotation of the radius, the leg bones do not move relative to each other. Rather, inversion takes place primarily through the transverse tarsal joint. This joint is actually two joints in a line: talonavicular and calcaneocuboid.

Muscles: tibialis anterior primarily, assisted by tibialis posterior.

Eversion of the ankle could be considered somewhat similar to pronation, except for the fact that its completely different. The sole of the foot is moved to face away from the midline, through the transverse tarsal joint primarily.

Muscles: fibularis longus, brevis, and tertius.